Question 450923
Assume a straight line with a constant slope
slope = {{{ (56.8 - 63.4) / 3 = -6.6 / 3 }}}
slope = {{{ -2.2 }}}
For 2012:
{{{ ( x - 56.8) / 4 = -2.2 }}}
{{{ x - 56.8 = -8.8 }}}
{{{ x = 48 }}}
The percentage of residents with a subscription 
to the local newspaper in 2012 is 48%